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It's similar to my 2nd solution. I prefer to show 5-4 in majors by 2d because I can pass it with weak hand and a lot of diamonds (I opened 1d).

Giving up strong jump shift has another problem:

1d-1h

2d-?

What do you bid with 6heards and invit hand?

What do you bid with 6heards and GF hand?

 

For me, giving up the natural meaning of 1-2 is too much, giving up

the SJS seems more reasonable.

 

1-1

2-?

 

I can argue that here 2 is invitational, because 2 is already

a playable partial and it's hard to justify why 2 is a better spot.

Thus jumping 3 is GF.

 

Okey, let's suppose we really really want 2 to be "weak to play", we can

still use AI (artificial invitation or "the 3rd suit forcing") to solve the problem,

again, jumping 3 is GF.

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